– 4 entries
EPA's Non-Monetization Cost-Benefit Methodology
Starting in January 2026, EPA under Administrator Lee Zeldin began declining to assign a dollar value to the health benefits of reduced air pollution in the cost-benefit analyses underlying its Clean Air Act rulemakings, while continuing to fully monetize industry compliance costs in the same analyses. Each entry documents a separate, independently significant rule that applies this same one-sided accounting methodology to a different pollutant, industry, or source category.
Starting with a January 15, 2026 rule for stationary combustion and gas turbines, EPA under Administrator Lee Zeldin began a pattern of declining to assign a dollar value to the health benefits of reduced air pollution in the cost-benefit analyses behind its Clean Air Act rulemakings, while continuing to fully monetize industry's compliance costs in the same analyses. The agency applied the same approach five weeks later in its February 24, 2026 repeal of the Mercury and Air Toxics Standards for coal- and oil-fired power plants, and, per reporting as of August 2026, in at least two further 2026 rulemakings not yet finalized: a proposed light- and medium-duty vehicle tailpipe rule (May 2026) and a proposed heavy-duty truck rule (July 9, 2026). Each entry in this episode is a separate, independently significant rule covering a different pollutant, industry, or source category -- this episode exists to link them as recurring instances of the same one-sided analytical methodology, not to substitute for recording each rule as its own event.
2026 Events (4)
EPA proposed heavy-duty truck rule weakening 2027 emissions durability standards, again declining to monetize health benefits
On July 9, 2026, the EPA under Administrator Lee Zeldin proposed amendments to model year 2027 and later heavy-duty truck emissions compliance rules -- shortening warranty periods, easing "useful life" requirements, and replacing an automatic engine power-derate for malfunctioning emissions controls with a driver alert -- changes EPA's own analysis said would raise ozone-forming nitrogen oxide pollution by 4.2% by 2030 and 11.6% by 2055. As it had in a January rule for stationary combustion turbines and a May light- and medium-duty vehicle tailpipe proposal, EPA's cost-benefit analysis for the truck rule quantified projected industry savings of $4,130 to $6,152 per engine but did not monetize the resulting health costs. The rule was not yet finalized as of this filing, with public comments due August 29, 2026.
EPA proposed delaying Tier 4 tailpipe standards for cars and trucks, again declining to monetize health benefits
On May 14, 2026, the EPA under Administrator Lee Zeldin proposed delaying the phase-in of "Tier 4" tailpipe pollution standards for light- and medium-duty vehicles by two model years, from model year 2027 to model year 2029. As it had in two earlier 2026 rulemakings, EPA's proposal quantified compliance-cost savings to automakers but explicitly declined to provide a monetized estimate of the resulting increase in PM2.5- and ozone-related health harm, citing modeling uncertainty. The rule was not yet finalized as of this filing.
EPA repealed Mercury and Air Toxics Standards for coal- and oil-fired power plants, again declining to monetize health benefits
On February 24, 2026, the EPA under Administrator Lee Zeldin finalized a repeal of the 2024 Mercury and Air Toxics Standards (MATS) amendments for coal- and oil-fired power plants, citing a 2020 finding that residual cancer risk was already below a presumptive acceptable threshold and eliminating continuous emissions monitoring requirements. As it had five weeks earlier in a separate rule for stationary combustion turbines, EPA did not monetize the health benefits of the toxic-pollutant reductions the standards had achieved, presenting only projected industry cost savings of $670 million through 2037. A coalition of 21 environmental and public-health organizations sued in the D.C. Circuit the following month.
EPA ended decades-long practice of monetizing air-pollution health benefits in Clean Air Act rulemaking analysis
On January 15, 2026, the EPA under Administrator Lee Zeldin finalized a rule revising New Source Performance Standards for stationary combustion and gas turbines that, for the first time, said the agency would no longer assign a dollar value to the health benefits of reduced fine particulate matter (PM2.5) and ozone pollution in its regulatory cost-benefit analysis, while continuing to fully count compliance costs to industry. The EPA cited general modeling uncertainty but did not cite new peer-reviewed science justifying a break from the quantification methods it and prior Republican administrations had used for decades. Senate Democrats led by Sen. Sheldon Whitehouse opened an investigation into the change in February 2026, and the agency applied the same non-monetization approach in at least one later 2026 rulemaking.